Circular Polarized Angle Of Arrival Measuring System

Patent metadata

Field	Value
Publication number	US-2019391224-A1
Application number	US-201916445468-A
Country	US
Kind code	A1
Filing date	Jun 19, 2019
Priority date	Jun 20, 2018
Publication date	Dec 26, 2019
Grant date	—

Abstract

Methods and systems are disclosed and include receiving a signal via a first communication channel at a plurality of azimuth angles. The method includes determining a plurality of first communication channel phase angle differences between a pair of antennas. The method includes receiving a second signal via a second communication channel and at the plurality of azimuth angles. The method includes determining a plurality of second communication channel phase angle differences between the pair of antennas that each correspond to one of the plurality of azimuth angles. The method includes generating a first reference curve based on the plurality of first communication channel phase angle differences. The method includes generating a second reference curve based on the plurality of second communication channel phase angle differences. The method also includes generating a calibration curve that is based on an interpolation of the first reference curve and the second reference curve.

First claim

1 . A method comprising:
receiving, using an antenna system, a signal via a first communication channel, wherein the antenna system receives the signal at a plurality of azimuth angles; determining, using a processing circuit that is configured to execute instructions stored in a non-transitory computer readable medium, a plurality of first communication channel phase angle differences between a pair of antennas of the antenna system, wherein each of the plurality of first communication channel phase angle differences corresponds to one of the plurality of azimuth angles; receiving, using the antenna system, a second signal via a second communication channel, wherein the antenna system receives the second signal at the plurality of azimuth angles; determining, using the processing circuit, a plurality of second communication channel phase angle differences between the pair of antennas, wherein each of the plurality of second communication channel phase angle differences corresponds to one of the plurality of azimuth angles; generating, using the processing circuit, a first reference curve based on the plurality of first communication channel phase angle differences; generating, using the processing circuit, a second reference curve based on the plurality of second communication channel phase angle differences; and generating, using the processing circuit, a calibration curve, wherein the calibration curve is based on an interpolation of the first reference curve and the second reference curve.

2 . The method of claim 1 , further comprising determining, using the processing circuit, a plurality of phase angle difference limits, wherein each of the plurality of phase angle difference limits is associated with one of the first communication channel and second communication channel.

3 . The method of claim 2 , further comprising storing, using the processing circuit, the calibration curve and the plurality of phase angle difference limits in a calibration index,
wherein calibration index values of the calibration index vary by radio frequency or communication channel.

4 . The method of claim 1 , wherein generating the first reference curve further comprises filtering, using the processing circuit, the first communication channel phase angle differences using a low-pass filter.

5 . The method of claim 4 , wherein generating the second reference curve further comprises filtering, using the processing circuit, the second communication channel phase angle differences using the low-pass filter.

6 . The method of claim 5 , wherein the low-pass filter is a finite impulse response low-pass filter.

7 . The method of claim 1 , wherein the interpolation of the first reference curve and the second reference curve is an average of (i) the phase angle difference of the first reference curve and (ii) the phase angle difference of the second reference curve.

8 . The method of claim 1 , further comprising generating, using the processing circuit, a plurality of additional reference curves, wherein each of the plurality of additional reference curves is associated with one of each remaining communication channel of the antenna system.

9 . The method of claim 8 , further comprising generating, using the processing circuit, the calibration curve based on an interpolation of the first reference curve, the second reference curve, and each of the plurality of additional reference curves.

10 . The method of claim 8 , wherein the first communication channel, the second communication channel, and each of the remaining communication channels are associated with a Bluetooth communication system.

11 . A system comprising:
an antenna system, wherein the antenna system is configured to receive
a signal via a first communication channel, wherein the antenna system receives the signal at a plurality of azimuth angles, and
a second signal via a second communication channel, wherein the antenna system receives the second signal at the plurality of azimuth angles; and
processing circuit that is configured to execute instructions stored in a non-transitory computer readable medium, wherein the instructions include
determining, using the processing circuit, a plurality of first communication channel phase angle differences between a pair of antennas of the antenna system, wherein each of the plurality of first communication channel phase angle differences corresponds to one of the plurality of azimuth angles,
determining, using the processing circuit, a plurality of second communication channel phase angle differences between the pair of antennas, wherein each of the plurality of second communication channel phase angle differences corresponds to one of the plurality of azimuth angles,
generating, using the processing circuit, a first reference curve based on the plurality of first communication channel phase angle differences,
generating, using the processing circuit, a second reference curve based on the plurality of second communication channel phase angle differences, and
generating, using the processing circuit, a calibration curve, wherein the calibration curve is based on an interpolation of the first reference curve and the second reference curve.

12 . The system of claim 11 , wherein the instructions further comprise determining, using the processing circuit, a plurality of phase angle difference limits, wherein each of the plurality of phase angle difference limits is associated with one of the first communication channel and second communication channel.

13 . The system of claim 12 , wherein the instructions further comprise storing, using the processing circuit, the calibration curve and the plurality of phase angle difference limits in a calibration index.

14 . The system of claim 11 , wherein generating the first reference curve further comprises filtering, using the processing circuit, the first communication channel phase angle differences using a low-pass filter.

15 . The system of claim 14 , wherein generating the second reference curve further comprises filtering, using the processing circuit, the second communication channel phase angle differences using the low-pass filter.

16 . The system of claim 15 , wherein the low-pass filter is a finite impulse response low-pass filter.

17 . The system of claim 11 , wherein the interpolation of the first reference curve and the second reference curve is an average of (i) the phase angle difference of the first reference curve and (ii) the phase angle difference of the second reference curve.

18 . The system of claim 11 , wherein the instructions further comprise generating, using the processing circuit, a plurality of additional reference curves, wherein each of the plurality of additional reference curves is associated with one of each remaining communication channel of the antenna system.

19 . The system of claim 18 , wherein the instructions further comprise generating, using the processing circuit, the calibration curve based on an interpolation of the first reference curve, the second reference curve, and each of the plurality of additional reference curves.

20 . The system of claim 18 , wherein the first communication channel, the second communication channel, and each of the remaining communication channels are associated with a Bluetooth communication system.

Assignees

• Denso Int America Inc
• Denso Corp

Inventors

• Stitt Raymond Michael
• Videtich John
• Guthrie Warren
• Jager Karl
• Peterson Thomas

Classifications

• G01S3/043

  Receivers · CPC title

• G01S3/48 Primary

  the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured · CPC title

• H01Q3/36

  with variable phase-shifters · CPC title

• H01Q21/29

  Combinations of different interacting antenna units for giving a desired directional characteristic (H01Q25/00 takes precedence) · CPC title

• H01Q19/10

  using reflecting surfaces · CPC title